A nucleus ${}_{Z}{}^{A}X$ has mass represented by m(A, Z). If ${m}_{p}$ and ${m}_{n}$ denote the mass of proton and neutron respectively and BE the binding energy (in MeV), then [2007]

(1) BE = [m(A, Z) - Z${m}_{p}$- (A - Z)${m}_{n}$${c}^{2}$

(2) BE = [Z${m}_{p}$+ (A - Z)${m}_{n}$- m(A,Z)] ${c}^{2}$

(3) BE = [Z${m}_{p}$+ A${m}_{n}$- m(A, Z)] ${c}^{2}$

(4) BE = m(A, Z) - Z${m}_{p}$- (A, Z)${m}_{n}$

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